Horse riding suit for man, before WWII. Buttons of "l'Étrier de Paris"

We propose this suit, made for an horserider in 1939, indication of date and name of owner are inside a pocket.
It includes:
Jacket chest size 100 cm, waist size 88 cm. Excellent condition.
Hat, for head size 57 cm, as new.
Recommanded for a total heigth around 180 cm.
Jacket is made in a quality of wool almost impossible to find now, collar and cuffs are made in silk velvet.
Buttons were used by members of" l'étrier de Paris".
They are still made in two pieces on front, each stirrup is goldplated and attached to the smooth part.
L'Etrier de Paris is located in bois de Boulogne, in the most prestigious part of Paris, and was created in 1895.
5 generations of horseriders used this institution.